Dynamic Analysis of Semi-Submersible Production Platform Under the Failure of Mooring Lines  

作　　者：CHUANG Zhen-ju LIU She-wen LI Chun-zheng LU Yu CHANG Xin 

机构地区：[1]Naval Architecture and Ocean Engineering College,Dalian Maritime University,Dalian 116026,China

出　　处：《China Ocean Engineering》2021年第1期84-95,共12页中国海洋工程（英文版）

基　　金：supported by the Fundamental Research Funds for the Central Universities,Dalian Maritime University,China(Grant Nos.3132019306 and 3132020116).

摘　　要：This paper quantitatively studies the transient dynamic response of a semi-submersible production platform with the loss of one or several positioning mooring lines.A semi-submersible platform,production risers,and positioning mooring lines are all included in the numerical simulation.Increased motion of the semi-submersible platform,tension variation of the remaining mooring lines/risers and the risk of mooring line or riser clashing are all investigated through fully coupled time-domain analysis.Combined environmental loads are selected from irregular waves and the steady current varying from very rough to extreme sea conditions.Three dimension radiation/diffraction theories and Morison’s equation are applied to calculate first-order wave force and second-order mean drift force of floating semi-submersible platform.Nonlinear time-domain finite element methods are employed to analyze the behavior of mooring lines and risers.Results show that the failure of mooring lines seriously reduce the platform’s stability performance.The tension of the rest lines is also increased accordingly.Remaining lines which are closer to the failed lines will have larger tension increase to compensate.Line-Line distance provides practical information for the risk of clashing investigation.

关 键 词：mooring line failure the transient response of platform tension variation of mooring line risk of lines clashing coupling effect between platform and mooring system 

分 类 号：P75[天文地球—海洋科学] TE95[石油与天然气工程—石油机械设备]